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105results about How to "Suppress power loss" patented technology
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Switching power supply device
InactiveUS20070145956A1Improve power conversion efficiencyImprove conversion efficiencyEfficient power electronics conversionElectric variable regulationDc dc converterEngineering
A switching power supply device has a boost power converter which converts a wide range of AC input voltages into a DC voltage larger than an amplitude of the AC input voltage to supply to a DC-DC converter. The switching power supply device includes a load detection circuit, an input voltage detection circuit, and a power conversion controller for the boost power converter. The power conversion controller corrects the determination reference value in accordance with the AC input voltage detected in the input voltage detection circuit. When a light load is detected based on a comparison between the corrected determination reference value and the detection value output from the load detection circuit, the controller disables the boost power converter.
Owner:SANKEN ELECTRIC CO LTD
Semiconductor device having improved insulated gate bipolar transistor and method for manufacturing the same
InactiveUS20070267663A1Lower turn-on voltageSuppress power lossTransistorSemiconductor/solid-state device manufacturingHigh concentrationEngineering
An n-type first base layer is formed on a semiconductor substrate 1 having a first major surface and a second major surface, and a p-type second base layer is formed thereon. Between the first base layer and the second base layer, a carrier stored layer is formed. The carrier stored layer has a high-concentration impurity layer and a low concentration impurity layer, and the high-concentration impurity layer has a thickness of 1.5 μm or more and an impurity concentration therethrough is made to be 1.0×1016 cm−3 or more throughout the layer.
Owner:MITSUBISHI ELECTRIC CORP
Ultrasonic transmitter, ultrasonic transceiver and sounding apparatus
InactiveUS20050007879A1Suppress emissionImprove efficiencySonic/ultrasonic/infrasonic transmissionMechanical vibrations separationDriver circuitTransceiver
A driver circuit for generating a driving signal by pulse-width modulation (PWM) includes a half-bridge circuit formed essentially of a pair of series-connected FETs. When the level of an ultrasonic signal, or of the driving signal, is to be maximized, the individual FETs are switched at a switching frequency matched to the frequency of the driving signal. When the level of the ultrasonic signal, or the driving signal is to be reduced, on the other hand, the individual FETs are switched with specific timing determined based on the frequency of a clock signal of which period is shorter than that of the driving signal.
Owner:FURUNO ELECTRIC CO LTD
Resonator, filter, duplexer, and communication device
InactiveUS20020000893A1Guaranteed current efficiencySuppress power lossSuperconductors/hyperconductorsSuperconductor devicesCapacitanceSpiral resonator
A resonator, a filter, and a duplexer are provided which are capable of very effectively suppressing the power loss caused by the edge effect, and which allow a great reduction in the overall size to be achieved. Also, a communication device including the above-mentioned filter or duplexer is provided. A ground electrode is formed over the bottom surface of a dielectric substrate, and a multiple spiral line pattern is formed on the top surface thereof. A radial line pattern is further formed on this surface with an insulation layer interposed therebetween. By thus disposing the radial pattern adjacently to the multiple spiral resonator constituted of the above-mentioned multiple spiral line, an electrostatic capacitance is added to the multiple spiral resonator. This reduces the occupation area of the resonator on the substrate, and improves the loss reduction effect.
Owner:MURATA MFG CO LTD
Voltage regulator
ActiveUS20090206807A1Improve accuracySuppress power lossElectric variable regulationCurrent limitingVoltage reference
Provided is a voltage regulator including an overcurrent protection circuit, which is capable of enhancing accuracy of a limit current value and a short-circuit current value, and suppressing electric power loss when an overcurrent flows through an output transistor. The overcurrent protection circuit includes: an output current detection transistor controlled by an output voltage of an error amplifier circuit, for feeding a detection current; a detection resistor for generating a detection voltage based on the detection current; a second error amplifier circuit for amplifying a difference between a voltage set by a second reference voltage and a divided voltage, and the voltage of the detection resistor, and outputting the amplified difference; and an output current limiting circuit in which a gate thereof is controlled by an output of the second error amplifier circuit, for controlling a gate voltage of the output transistor. Further, the second reference voltage is supplied from a temperature detection circuit.
Owner:ABLIC INC
Battery protective device and semiconductor integrated circuit device
InactiveUS20080278116A1Avoid thermal damageEasy to detect chargeTransistorElectronic switchingElectrical resistance and conductanceEngineering
A battery protective device that protects against battery damage and semiconductor destruction from overdischarge and overcharge of the battery. Resistance across switching elements is controllable to prevent current leakage through parasitic dipole elements in the integrated circuit. Current is detected with an overdischarge detecting circuit and an overcharge detecting circuit. Direction of the current to / from the battery is detected by discharge overcurrent and charge overcurrent detecting circuits. Switching discharge FETs and charge FETs are enabled as independently controlled, ON-OFF parallel switching elements, interposed in series in the charge / discharge current path of the battery. Only a part of the discharge or charge switching FETs can be turned ON and OFF for accurate current control in accordance with the detected current and its direction.
Owner:FUJI ELECTRIC CO LTD
Resonator, filter, duplexer, and communication device
InactiveUS20010043129A1Guaranteed current efficiencySuppress power lossSuperconductors/hyperconductorsSuperconductor devicesHelical lineCommunication device
A resonator includes a hollow dielectric element having a hole therein, a helical line unit including a plurality of helical lines formed in the hole, and a ground electrode formed on an outer surface of the dielectric element.
Owner:MURATA MFG CO LTD
Transmitter
InactiveUS20050215209A1Without reducing efficiencySuppression pressure dropAmplifier modifications to reduce non-linear distortionResonant long antennasAudio power amplifierDc dc converter
An amplitude component and a phase component of a modulated signal are inputted into a power supply terminal and an input terminal of an RF power amplifier, respectively, and a modulated wave that is produced by demodulating an original modulated signal is obtained from the RF power amplifier. A supply voltage is supplied to an emitter follower and an operational amplifier via a switch group from a DC-DC converter group whose output voltages are sequentially different. As the supply voltage, any pair of outputs of DC-DC converters by the switch group is selected according to levels of the amplitude component, and provides them to the emitter follower and the operational amplifier. The emitter follower performs a DC conversion of the provided supply voltage to provide it to the RF power amplifier.
Owner:PANASONIC CORP
High-frequency circuit, high-frequency device, and communications apparatus
ActiveUS20110110452A1Suppressed transmission power lossSuppression of reception sensitivity reductionSolid-state devicesDiversity/multi-antenna systemsCommunications systemMultiplexer
A high-frequency circuit comprising first and second antenna terminals, a transmitting terminal and first and second receiving terminals for first and second communications systems, and first and second switch circuits each having a common terminal and at least first and second switching terminals; the first antenna terminal being connected to a common terminal of the first switch circuit, the transmitting terminal for the first communications system being connected to the first switching terminal of the first switch circuit, the second antenna terminal being connected to a common terminal of the second switch circuit, the transmitting terminal for the second communications system being connected to the first switching terminal of the second switch circuit, each first receiving terminal for the first and second communications systems being connected to the second switching terminal of the first switch circuit via a first receiving-side multiplexer circuit, each second receiving terminal for the first and second communications systems being connected to the second switching terminal of the second switch circuit via a second receiving-side multiplexer circuit.
Owner:MURATA MFG CO LTD
Hybrid system of vehicle
InactiveUS20070227792A1Suppress power lossAccurate output powerAuxillary drivesInternal combustion piston enginesHybrid systemElectric power system
Disclosed is a hybrid system of vehicle capable of accurately generating an engine output in conformity to a required vehicle driving power and suppressing an electric power loss even when a battery is used for correcting electric power to prevent occurrence of overshoot or undershoot. The hybrid system of vehicle is designed to drive a generator by an engine and supply an electric power generated by the generator directly to a wheel-driving electric motor so as to drive the motor. The hybrid system of vehicle comprises required motor output setting means for setting a required output of the motor depending on a required vehicle driving power, required generator output setting means for setting a required output of the generator depending on the required motor output set by the required motor output setting means, and engine output setting means for setting an output of the engine depending on the required generator output set by the required generator output setting means.
Owner:MAZDA MOTOR CORP
Rectifier circuit, semiconductor device using the rectifier circuit, and driving method thereof
InactiveUS20080083969A1Suppress power lossPrevent short-circuitsAc-dc conversion without reversalEfficient power electronics conversionSmall amplitudeParasitic capacitance
An object of the present invention is to provide a rectifier circuit which can suppress loss of power due to parasitic capacitance or parasitic inductance of a semiconductor element. The rectifier circuit matches or mismatches impedance between a circuit of a previous stage and the rectifier circuit in accordance with the amplitude of an input AC voltage. When an AC voltage to be input has a smaller amplitude than a predetermined voltage, impedance is matched and the AC voltage is applied as is to the rectifier circuit. Conversely, when an AC voltage to be input has a larger amplitude than a predetermined voltage, impedance is mismatched, and the amplitude of the AC voltage is decreased by reflection and then the AC voltage is applied to the rectifier circuit.
Owner:SEMICON ENERGY LAB CO LTD
Sma actuator driving device, and image pickup device incorporated with the same
InactiveUS20090009656A1Suppress power lossGreat fabricationTelevision system detailsProjector focusing arrangementDriving currentElectrical resistance and conductance
In a shape memory alloy actuator driving device, a predetermined constant current is applied to a shape memory alloy member as a retrieval signal to detect a terminal voltage of the shape memory alloy member, and a detection result of the terminal voltage is compared with a target voltage value to be calculated based on a target resistance value of the shape memory alloy member and a value of the constant current to cause a driving circuit to output, to the shape memory alloy member, a drive current that makes the detection result substantially equal to the target voltage value.
Owner:KONICA MINOLTA OPTO
Switching power supply device
InactiveUS7453248B2Improve conversion efficiencyIncreased power lossEfficient power electronics conversionElectric variable regulationDc dc converterBoost power converter
Owner:SANKEN ELECTRIC CO LTD
Power inverter and electric power steering controller
ActiveUS20120206075A1Suppress power lossIncrease amplitudeCommutation monitoringMotor/generator/converter stoppersPower inverterElectric power steering
A power inverter is provided that can apply to an AC rotary machine three-phase voltages of high amplitudes and low distortion while suppressing ohmic loss attributed to current detection resisters. The power inverter includes a superimposed voltage command computing means for computing and outputting a superimposed voltage command depending on the difference between a maximum value and a minimum value of three-phase voltage commands; a voltage command modification means for adding the superimposed voltage command to each of the three-phase voltage commands and outputting modified three-phase voltage commands; and a power output means for outputting the three-phase voltages based on the modified three-phase voltage commands.
Owner:MITSUBISHI ELECTRIC CORP
Output current detecting circuit and transmission circuit
ActiveCN102064692ASuppress power lossSmall footprintCurrent/voltage measurementDc-dc conversionElectrical resistance and conductanceVoltage reference
Owner:MITSUMI ELECTRIC CO LTD
Lighting controller for lighting device for vehicle
ActiveUS7352135B2Suppress power lossElectroluminescent light sourcesElectric light circuit arrangementElectrical resistance and conductanceEngineering
A lighting controller for a lighting device for a vehicle includes a semiconductor light source; a power source for supplying electric power; and control circuitry for controlling a supply of a current to the semiconductor light source. The control circuitry selectively supplies the current to the semiconductor light source through a resistance element or through a bypass circuit for bypassing the resistance element based on a determination of a state of the current. A method for controlling a lighting device for a vehicle includes receiving electric power from a power source; supplying a current to a semiconductor light source; determining a state of the current supplied to the semiconductor light source; and selectively supplying the current to the semiconductor light source through a resistance element or through a bypass circuit for bypassing the resistance element based on the determination of the state of the current.
Owner:KOITO MFG CO LTD
Transmitter
InactiveUS7116947B2Without reducing efficiencySuppression pressure dropAmplifier modifications to reduce non-linear distortionResonant long antennasAudio power amplifierDc dc converter
An amplitude component and a phase component of a modulated signal are inputted into a power supply terminal and an input terminal of an RF power amplifier, respectively, and a modulated wave that is produced by demodulating an original modulated signal is obtained from the RF power amplifier. A supply voltage is supplied to an emitter follower and an operational amplifier via a switch group from a DC-DC converter group whose output voltages are sequentially different. As the supply voltage, any pair of outputs of DC-DC converters by the switch group is selected according to levels of the amplitude component, and provides them to the emitter follower and the operational amplifier. The emitter follower performs a DC conversion of the provided supply voltage to provide it to the RF power amplifier.
Owner:PANASONIC CORP
Battery protective device and semiconductor integrated circuit device
InactiveUS7737664B2Avoid thermal damageSimple circuit configurationTransistorElectronic switchingElectrical resistance and conductanceEngineering
A battery protective device that protects against battery damage and semiconductor destruction from overdischarge and overcharge of the battery. Resistance across switching elements is controllable to prevent current leakage through parasitic dipole elements in the integrated circuit. Current is detected with an overdischarge detecting circuit and an overcharge detecting circuit. Direction of the current to / from the battery is detected by discharge overcurrent and charge overcurrent detecting circuits. Switching discharge FETs and charge FETs are enabled as independently controlled, ON-OFF parallel switching elements, interposed in series in the charge / discharge current path of the battery. Only a part of the discharge or charge switching FETs can be turned ON and OFF for accurate current control in accordance with the detected current and its direction.
Owner:FUJI ELECTRIC CO LTD
Electric motor control device, electric vehicle, and hybrid electric vehicle
ActiveUS7928686B2Reduce noiseSuppress power lossAuxillary drivesAC motor controlControl signalEngineering
An electric motor control device includes a direct current power source; an inverter interposed between an electric motor and the direct current power source, the inverter device controlling an exchange of electric power therebetween; an inverter control unit that generates PWM pulses having a duty ratio corresponding to voltage command signals and sends the PWM pulses to the inverter in order to switch the inverter; a frequency changing unit that changes a carrier frequency of the PWM pulses generated by the inverter control unit in a manner corresponding to a frequency control signal; and a motor control unit.
Owner:AISIN AW CO LTD
SMA actuator driving device, and image pickup device incorporated with the same
InactiveUS8068167B2Suppress power lossGreat fabricationTelevision system detailsProjector focusing arrangementDriving currentTerminal voltage
In a shape memory alloy actuator driving device, a predetermined constant current is applied to a shape memory alloy member as a retrieval signal to detect a terminal voltage of the shape memory alloy member, and a detection result of the terminal voltage is compared with a target voltage value to be calculated based on a target resistance value of the shape memory alloy member and a value of the constant current to cause a driving circuit to output, to the shape memory alloy member, a drive current that makes the detection result substantially equal to the target voltage value.
Owner:KONICA MINOLTA OPTO
Vehicle power supply device
ActiveUS7847429B2Suppressing deterioration of a capacitorReduce pre-charge timeBatteries circuit arrangementsElectric devicesCapacitor voltageEnergy regeneration
The present invention provides a vehicle power supply device that is capable of suppressing deterioration of a capacitor, shortening a precharging time, and suppressing power loss. An ECU estimates a polarization condition of a battery after a key has been switched OFF (IG SW_OFF), and opens a main relay after determining that the polarization condition of the battery has been eliminated. Thus, a voltage difference between a battery voltage and a capacitor voltage when the main relay is subsequently reconnected can be reduced. Hence, even when the capacity of the capacitor is increased, the time required for precharging can be shortened, and energy regeneration and so on can be realized efficiently within a short time period after switching the key ON. In this case, a situation in which the post-release capacitor voltage is maintained at an unnecessarily high level can be prevented even when charging polarization occurs in the battery, and as a result, deterioration of the capacitor can be suppressed.
Owner:SUBARU CORP
Discharge power supply apparatus
ActiveUS20050007034A1Suppress power lossAvoid easy dischargeAc-dc conversion without reversalElectric light circuit arrangementEngineeringConductor Coil
This discharge power supply apparatus is for supplying a D. C. voltage to a discharge load 6 and discharging the same. The discharge power supply apparatus includes an inverter circuit 2 that converts D. C. voltage to A. C. voltage; a transformer 3 having a primary winding 3a to which the A. C. voltage output by the inverter circuit 2 is supplied and a secondary winding 3b; a full-wave rectifier circuit 4 that has a plurality of diodes 4A to 4D and rectifies the A. C. voltage generated by the secondary winding 3b; and a trigger capacitor 7 connected in parallel to a part of the diodes of the full-wave rectifier circuit 4.
Owner:ORIGIN CO LTD
Control device for vehicle
ActiveUS20160131256A1Reduce vibrationSuppress power lossDigital data processing detailsGearingDrive wheelPath switching
A control device for vehicle is includes: transmission mechanism capable of setting fixed transmission gear ratio; continuously variable transmission provided in parallel with transmission mechanism; and path switching mechanism for selectively blocking torque transmission path that includes transmission mechanism and that is configured to dampen vibration. Control device for vehicle includes clutch mechanism wherein continuously variable transmission and transmission mechanism capable of setting constant transmission gear ratio are arranged in parallel between input shaft and output shaft, that selectively connects torque transmission path stretching from internal combustion engine to drive wheels via transmission mechanism in manner capable of transmitting torque, and wherein one clutch and other clutch are arranged in series and other clutch is arranged on relatively downstream side, and is configured to engage either one of one clutch and other clutch in case where torque is transmitted from internal combustion engine to drive wheels via continuously variable transmission.
Owner:TOYOTA JIDOSHA KK
Gearbox
InactiveCN102459961AEfficient cycleImprove reliabilityToothed gearingsGear lubrication/coolingRotational axisEngineering
Provided is a gearbox provided with a lubrication structure wherein a lubricant that has been distributed can be efficiently supplied to each location to be lubricated, and the power loss is small. The gearbox is comprised of shaft bodies supported by a case (10) in the axial directions of the shaft bodies; a plurality of gears which are supported by the shaft bodies and which are rotatably coupled to the shaft bodies by a shift clutch; a large-diameter gear (80) among the plurality of gears, which has a lower portion immersed in a lubricant contained in a lubricant storage area (91) formed in the lower portion of the case (10) and which rotates to distribute the lubricant upwardly; and a receiver (92) which extends in a direction of the rotational axis of the large-diameter gear (80) to collect the distributed lubricant and circulate the lubricant to locations to be lubricated. The receiver (92) is comprised of a vertical wall (92d) having a surface on which the lubricant that has been distributed to disperse above the receiver impinges and moves downwardly, to introduce the lubricant to a collecting portion of the receiver, and an introduction portion (94) having a surface on which the lubricant that disperses between the receiver (92) and the large-diameter gear (80) flows due to the inertia force, to introduce the lubricant to a collecting portion (92a).
Owner:AISIN AI CO LTD
Switch electric power device
InactiveCN1638253ASuppress power lossApparatus with intermediate ac conversionPeak valueElectric power
The present invention provides a switching power supply device capable of suppressing power loss in a starting circuit even when an input voltage rises. The input voltage detection part 21 detects the input voltage, and when the peak value of the input AC voltage is above a predetermined value, the transistor Q6 of the starting current control part 25 is turned off, and the current i1 flowing in the starting circuit 21 is reduced, so The conduction angle of the transistor Q6 is narrowed in inverse proportion to the input voltage Vi, and the average value of the current i flowing in the starting circuit 21 is decreased in inverse proportion to the input voltage Vi.
Owner:SANKEN ELECTRIC CO LTD
Electric motor drive system for an electric vehicle
ActiveUS8639405B2Ensure drivabilityImprove fuel efficiencyHybrid vehiclesAuxillary drivesFuel efficiencyElectric vehicle
In an electric motor drive system for an electric vehicle that includes a converter for performing direct-current voltage conversion and an inverter that converts the output voltage of the converter into alternating-current voltage, a control apparatus makes a required torque response determination to determine whether the electric vehicle is in a state in which high torque response is needed. Furthermore, in a drivability priority mode in which high torque response is needed, the control apparatus sets a voltage command value for the converter in a range where sine wave PWM control can be applied. On the other hand, in a fuel efficiency priority mode in which high torque response is not needed, the control apparatus sets the voltage command value for the converter such that power loss in the overall electric motor drive system is minimized, based on the operating state of an alternating-current electric motor.
Owner:TOYOTA JIDOSHA KK
Optical module and camera module
InactiveUS20050207026A1Assures accuracy of movementSuppress power lossProjector focusing arrangementCamera focusing arrangementOptical ModuleOptical axis
Provided is an optical module that is thin, allows freedom of design in configuration, and assures the accuracy of movement of an optical part while suppressing power loss. A stepping motor 26 and a lens barrel 27 that is moved by moving means 28 are positioned offset from each other along a base plate 23, and the optical axis of the lens barrel 27 and the axis of a rotor 37 provided in the stepping motor 26 are arranged in parallel with each other on one surface of the base plate 23. Further, a reduction gear train 29, which operatively couples the rotor 37 and the moving means 28 together, is arranged on the one surface. The stepping motor 26 consists of a flat-shaped motor equipped with: coil blocks 35 each having an excitation coil 39 horizontally mounted along the base plate 23; a yoke 36 whose magnetic path portion 36a excluding end portions 36b and 36c connected with the coil blocks 35 is provided so as not to overlap the coil blocks 35; and the rotor 37 arranged within a rotor pass-through hole 40 of the yoke 36.
Owner:SEIKO INSTR INC
Voltage regulator
InactiveUS8004257B2Improve accuracyIncrease valueElectric variable regulationCurrent limitingPower flow
A voltage regulator has a first error amplifier circuit that amplifies a difference between a first reference voltage and a voltage based on an output voltage of an output transistor, and an overcurrent protection circuit that detects an overcurrent flowing through the output transistor and limits a current of the output transistor. The overcurrent protection circuit has an output current detection transistor that feeds a detection current in accordance with an output current of the output transistor, a voltage generation circuit that generates a voltage based on the detection current, a second error amplifier circuit that amplifies a difference between the voltage from the voltage generation circuit and a voltage set by a second reference voltage supplied by a temperature detection circuit and a voltage based on the output voltage, and an output current limiting transistor that controls a gate voltage of the output transistor and has a gate that is controlled by an output of the second error amplifier circuit.
Owner:ABLIC INC
Slewing type working machine
InactiveUS8881519B2Reduce back pressureSuppress power lossFluid couplingsServomotor componentsHydraulic motorHydraulic pump
A slewing-type working machine capable of reducing back pressure generated during slewing. The slewing-type working machine includes: a base carrier; an upper slewing body; a hydraulic motor including first and second ports and slewing the upper slewing body; a hydraulic pump, a slewing operation device including an operating member; a control valve controlling the hydraulic motor based on the operation signal of the slewing operation device; first and second pipe-lines connecting the first and second ports of the hydraulic motor to the control valve; a communication switching device capable of switching communication and cutting of between both pipe-lines and the tank; and a switching command section operating the communication switching devices, when the upper slewing body is slewed, to bring only a pipe-line, which corresponds to a discharge-side pipe-line of the hydraulic motor, of the pipe-lines into communication with the tank, while bypassing the control valve.
Owner:KOBELCO CONSTR MASCH CO LTD
Electric motor control apparatus
ActiveUS7071639B2Suppress power lossSpeed controllerBatteries circuit arrangementsEngineeringControl theory
Owner:HONDA MOTOR CO LTD
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